Heating metal melts



July 29, 1930., A. FRY

HEATING IETAL IBLTS Filed [lay 3, 1929 Patented July 29, 1930 UNITED STATES PATENT oF1-"1c ADOLF FRY, OF EBSEN, GERMANY, ASSIGNOB TO FRIED. KRUPP AKTIENGEBELLBGHAFT,

I O1 ESSEN-ON-THEBUHB, GERMANY HEATING METAL MELTS Application flled Kay 8, 1929, Serial No. 860,261, and in Germany Kay 18, 19128.

The invention relates to a new device intended to heat a mass of molten metal or alloy within a ladle,

affords peculiar advantages in service. According to the invention a heating element is provided which can be dipped in the melt.

In orderthat the invention can be more easily understood a device intended to heat a ladle as used in steel works is illustrated as an embodiment of the invention and by way of example in the accompanying drawing in which Figure l is a vertical section through the ladle and the heating device dipped. in the content thereof, and

Figure 2 is a section on line 22 1, seen from the top.

Referring to these figures, A denotes the ladle filled with a molten steel'alloy B tapped of Figure from the furnace andstill in liquid state.

By means of a suitable appliance (not shown) a body G is dipped in the ladle which body is intended to heat the steel melt therein. The body C is made of a refractory and electrically non-conductive material, e. g. concrete, and substantiall has the she e of a hollow cylinder. On its top front ace the body C carries two diametrally o posed extensions a. A spirally wound e ectric coil -D is embedded in the body C in the manner to be seen from the drawing which coil is formed in a manner known in itselfe. g. by a copper pipe through which cooling water is conducted while the heating device is in operation. The coil D is adaptedto be connected e. g. to an alternating current main .Of high frequency (e. g. of 8000 cycles).

In operation the body C a the coil D of which has been connected to the high frequency main is di ped in the steel melt B by means of a suitable appliance (not shown) and left in this osition as long as the melt should be heated Under the action of the high frequency current flowing through coil amperage is generated in the steel melt latter is both powerfully heated and agitated, see the arrows, F i direction of agitation. This heating of the by which the re 1, that indicate thev steel melt within the ladle has the effect of foreign bodies, such as oxydes, slag constituents, etc., still therein having a longer time the opportunit to rise to the surface and to go over into t e slag, than it would be the case,- if no supplemental heating of the melt would take place within the ladle. A further advantage of the described device con-- sists in the fact of the steel melt bein agitated owing to the indicated manner ofdieing heated and of the portions first near the bottom of the ladle of the melt rising to the surface and thus having the opportunity to more easily give off their (gaseous and non-gaseous) foreign bodies to the slag. Consequently the use of the described device still affords the advantage of the melt very satisfactorilyl being liberated of gases the degree of whic liberation can be increased still by the heating of the ladle being performed in an evacu-' ated space. Furthermore the notable advantag? is afforded of the device being enabled to e used without any difliculty in connection with the ordinary ladles used in iron works. When additions such as deoxidizing means are to be added to the melt finally the advantage is given of these additions quickly and uniformly being distributed on the melt owing to its being eddied due to the induction heating.

I claim 1. A device for heating a metallic melt in a ladle comprising a body, a longitudinal passage extending from the bottom of the top of said body, a passage extending from the upper end of said first passage to the exterior of said body, means to suspend said body in a ladle with said second passage below the level of the melt in said ladle, and a coil embedded 'in said body and adapted tobe fed by altered to be fed. with alternating current, said emtensians being adapted to suspend said bedy in the metallic melt with said. first named passages below the level of said melt.

The feregoing specification signed at C0- logne, Germany, this 19th day of April, 1929.

ADOLF 

